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प्रश्न
What is the pressure exerted by 75 cm vertical column of mercury of density 13600 kgm−3 in SI units?
[Take g = 9.8 ms−2].
उत्तर
Vertical length of mercury column = h = 75 cm = 0.75 m
Density of mercury = p = 13600 kg m−3
Acceleration due to gravity = g = 9.8 ms−2
Pressure = P = ?
p = hpg
P = 0.75 × 13600 × 9.8
P = 99960 Pa
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[Density of mercury = 13600 kg/m3 and g = 10 m/s2]
(i) Calculate the height of a water column which will exert on its base the same
Pressure as the 70 cm column of mercury.
(ii) Will the height of the water column change if the cross-section of the water column is made wider?
What is the SI unit of density?
